* {
    padding: 0;
    margin: 0;
}
ul,li {
    list-style: none;
}
body {
    background-color: #ccc;
}
.wrapper {
    margin: 100px auto;
    width: 1000px;
    height: 625px;
    text-align: center;
    position: relative;
}
.wrapper h1 {
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translatex(-50%);
    color: burlywood;
    z-index: 1;
}
audio {
    border-radius: 10px;
    width: 400px;
    height: 40px;
    position: absolute;
    bottom:10px;
    left: 50%;
    transform: translatex(-50%);
    /* z-index: 1 */
    opacity: 0.6;
}
.container {
    margin: 20px auto;
    width: 800px;
    height: 400px;
    padding-bottom: 50px;
    position: relative;
    top: 60px;
    border-radius: 10px;
    overflow: hidden;
}
.wrapper img {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
}
.container ul {
    position: absolute;
    width: 100%;
    left: 0;
    top: 20px;
    color: #fff;
    pointer-events: none;
    font-size: 25px;
    font-weight: bold;
    font-family: '宋体';
    z-index: 1;
    transition: 0.2s;
    padding-top: 20px;
}
.container ul li {
    height: 40px;
    line-height: 40px;
    transition: 0.2s;
}
.container ul li.active {
    color: rgb(4, 225, 250);
    transform: scale(1.3);
    font-weight: bolder;
}
